RADIUS, exchange or my own router issue last night?

Am on the Bradwell Abbey exchange and about 7.50 last night I lost PPP

The router (Billion 8800NL with 2.32e firmware) indicated it was in sync, clicked reconnect and it showed connecting for about 5 minutes and the connect button appeared again as if it had given up.

Rebooted, it resynced, but again stuck on connecting.

The router's own diagnostics were showing it was in sync and had negotiated a PPP session with the PPP server but authentication had failed.

It took a further rebboot to restore service.

It crossed my mind that the exchange kit (am on a Zen LLU circuit) might not support SRA and PhyR so have disabled these this morning (off out to work shortly) but just wondered if there were any issues last night?